1995 GTX Won't Rev Out

[DBecker504]

Reaching out for help on my 1995 GTX. It's having an issue where it will start perfectly and idle relatively well, but it will not rev out. It'll come up in RPM a bit and then acts like it hits a limiter. This has been an incredibly long fiasco so here is the entire breakdown

Last year we had it on the water and it was running perfect. Got it back to the dock, shut it off, then it didn't want to stay running. I narrowed that down to the kill switch ground wire having a poor connection and got it fixed. But prior to figuring that out I:

- Rebuilt the carbs with genuine Mikuni kits
- Verified pop off at ~28psi on both carbs
- Set low and high speed screws to factory specs
- Installed new gaskets from carb to engine
- Replaced all fuel lines
- Replaced fuel selector
- Pulled the tank out to fix a cracked neck and deep cleaned it while it was out
- Checked all vents to ensure they're working
- Replaced regulator/rectifier with a known good unit
- Replaced MPEM with a known good unit
- Replaced plugs and gapped correctly
- Checked compression (~130-135 in both jugs)
- Checked to make sure oiler lever is timed correctly and functioning correctly
- Replaced water separator
- Adjusted low speed screws to try to see if any changes occured with no luck
- Reverified pop off
- Checked for intake leaks and could not locate any
- Cut back spark plug wires and ensured bright blue spark on both cylinders

I'm sure there's more I've thrown at it, but that's all I can remember. It'll fire up immediately and idle all day long, but it just hits a complete dead stop if I try to rev it out. I've never had something fight me the way this thing is. Appreciate any help or suggestions!

 

[MAL]

I hope you get a better answer than mine, but it sounds like a fuel problem to me. did you use transparent fuel lines. You can learn a lot by watching for air in the lines. It just sound like it's either not getting fuel through the high speed circuit or getting way too much. Does choking it help? What do the plugs look like? You can put the fuel line in a gas can to eliminate a restriction in the fuel tank If you have a timing light you can use it to see if you still have spark as it is dying.

 

[burtshaver2021]

Just a couple idea’s but you could try turning your low speed screws in a 1/4 turn. If it doesn’t help put them right back to where you have them now. Also have you measured the voltage at the battery while running. I’ve heard that bad voltage regulators can give weird issues, I know you changed it already but… you’ve changed nearly everything in this. Have you checked the exhaust hose? I believe it’s after the water box, they can collapse internally

 

[burtshaver2021]

Actually only turn them in 1/8, if no help put them back where you had them.